if a plank of wood is 220cm long . I cut it into 14cm pieces. what length of wood I have left over?
- Thread starter uka
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I'll solve a similar problem:
I have 200 $ in my pocket. I want to purchase several pens worth 6$ each. How many pens (maximum) can I buy with the money (in my pocket) and how much money will be left over?
# of pens that I can buy = 200/6 = 33 + fraction
Cost of 33 pens (money) spent = 33*6 = 198 $
Money left in my pocket= 200 - 198 = 2 $
Follow the same procedure.....
Amazing , it does make sense. I divided 220 by 14 but the result was 15.7 that made me wonder .thank youuu
Steven G
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I once asked a similar question on an exam. It was something like you have a 6ft piece of wood and want to cut it into 2ft pieces, how many pieces do you get?
This student's answer was 2 and immediately came to me after the test and told me that I marked him wrong--and he was correct.
This student was a construction worker and knows 1st hand that what you see on the floor after you cut wood is wood! What he told me was that you have to put a 2ft mark on the wood and then cut just after that mark to get a 2ft piece of wood. What is left over is NOT a 4ft piece of wood! Think about what is on the floor!!
I had to give him the credit and we talked about how he shouldn't think that way in this math class anymore
This student's answer was 2 and immediately came to me after the test and told me that I marked him wrong--and he was correct.
This student was a construction worker and knows 1st hand that what you see on the floor after you cut wood is wood! What he told me was that you have to put a 2ft mark on the wood and then cut just after that mark to get a 2ft piece of wood. What is left over is NOT a 4ft piece of wood! Think about what is on the floor!!
I had to give him the credit and we talked about how he shouldn't think that way in this math class anymore
Steven G
Elite Member
- Joined
- Dec 30, 2014
- Messages
- 14,379
Another way of thinking about it:
You have a 220cm of wood.
You cut off a 14cm piece of wood. Now you have 1 14cm piece of wood and a 206cm piece of wood.
You cut off another 14cm piece of wood. Now you have 2 14cm pieces of wood and a 192cm piece of wood.
You cut off another 14cm piece of wood. Now you have 3 14cm piece of wood and a 178cm piece of wood.
You cut off another 14cm piece of wood. Now you have 4 14cm piece of wood and a 164cm piece of wood.
You cut off another 14cm piece of wood. Now you have 5 14cm piece of wood and a 150cm piece of wood.
Keep going! Or did you figure out that this is a long division problem?
You have a 220cm of wood.
You cut off a 14cm piece of wood. Now you have 1 14cm piece of wood and a 206cm piece of wood.
You cut off another 14cm piece of wood. Now you have 2 14cm pieces of wood and a 192cm piece of wood.
You cut off another 14cm piece of wood. Now you have 3 14cm piece of wood and a 178cm piece of wood.
You cut off another 14cm piece of wood. Now you have 4 14cm piece of wood and a 164cm piece of wood.
You cut off another 14cm piece of wood. Now you have 5 14cm piece of wood and a 150cm piece of wood.
Keep going! Or did you figure out that this is a long division problem?